#include <sys/types.h>
#include <dirent.h>
#include <stdlib.h>
#include <unistd.h>

void f(void)
{
	DIR *d;
	struct dirent *de;

	d = opendir("/proc/self/fd");
	while ((de = readdir(d))) {
		int fd = atoi(de->d_name);
		asm volatile ("" :: "g" (&fd) : "memory");
	}
	closedir(d);
}

static inline long sys_fdmap(int pid, int *fd, unsigned int n, int start)
{
	register long r10 asm ("r10") = start;
	register long r8 asm ("r8") = 0;
	long rv;
	asm volatile (
		"syscall"
		: "=a" (rv)
		: "0" (334), "D" (pid), "S" (fd), "d" (n), "r" (r10), "r" (r8)
		: "rcx", "r11", "cc", "memory"
	);
	return rv;
}

void g(void)
{
	int fd[1024];

	sys_fdmap(0, fd, sizeof(fd)/sizeof(fd[0]), 0);
}

int main(void)
{
	unsigned int i;

//	for (i = 0; i < (1<<22); i++)
//		f();

	dup(0);
	for (i = 0; i < (1<<22); i++)
		g();

	return 0;
}